Wall dropped $4.9 million on an eight-bedroom, 10-bath, 17,350-square-foot home in Potomac, Md., just outside the Beltway. And it's remarkably understated? At least in relative terms. Sure, it's got a sauna, a six-car garage, a pool with a waterfall, an outdoor kitchen, and a tennis court, but there's no grotto or gorilla room.